c++堆优化标准版AC， 弱化版第3个WA了...

#include <bits/stdc++.h>
using namespace std;
const int N = 100005;
const int inf = 0x3f3f3f3f;
struct node {
    int v, w;
    node(int vv, int ww) {
        v = vv;
        w = ww;
    }
};
vector<node> g[N];
int n, m, s;
int d[N];
set<pair<int, int> > min_heap;
void read(int u, int v, int  w) {
    g[u].push_back(node(v, w));
}
void Dijkstra() {
    min_heap.insert(make_pair(0, s));
    while (min_heap.size()) {
        int mind = min_heap.begin() -> first;
        int v = min_heap.begin() -> second;
        min_heap.erase(min_heap.begin());
        for (int i = 0; i < g[v].size(); i++) {
            if (d[g[v][i].v] > d[v] + g[v][i].w) {
                min_heap.erase(make_pair(d[g[v][i].v], g[v][i].v));
                d[g[v][i].v] = d[v] + g[v][i].w;
                min_heap.insert(make_pair(d[g[v][i].v], g[v][i].v));
            }
        }
    }
}
int main() {
    cin >> n >> m >> s;
    for (int i = 0; i < m; i++) {
        int u, v, w;
        cin >> u >> v >> w;
        read(u, v, w);
    }
    memset(d, inf, sizeof(d));
    d[s] = 0;
    Dijkstra();
    for (int i = 1; i <= n; i++) {
    	if (d[i] < 1000000){
        	cout << d[i] << " ";
		}else{
			cout << pow(2, 31) - 1 << " ";
		}
    }
    return 0;
}